Monster Authorized Dealer, 1 Year USA Warranty BUILDING ON THE LEGEND: Monster launched the iSport Freedom in 2013 as the world's first sport-specific on ear headphone. Now, the revised and re-booted version brings cutting edge technology and a sleek new design to the flagship in the iSport line up. PURE MONSTER SOUND: Music is proven to increase athletic performance by up to 15%, whether it's your first trip to the gym or you're a seasoned athlete. Monster's signature ingredient for iSport delivers crystal clear details, with pumping bass to keep you motivated through your training.